Carbon dioxide — FTIR absorption peaks and assignments

Quick answer

Carbon dioxide is usually assigned by looking for a recurring cluster of characteristic peaks rather than one exact textbook number. The table below shows where the literature most often places this group in FTIR, ranked by accumulated evidence.

Characteristic FTIR peaks for Carbon dioxide

Showing the 30 best-supported peaks of 156 total for Carbon dioxide.

Spectrum logic

A functional-group assignment becomes more confident when several expected bands appear together. Use this page to find the strongest-supported peaks, then confirm that the same sample exhibits a coherent pattern rather than a single isolated hit.

Real-world usage

These pages are useful for unknown material analysis, peak explanation in reports, polymer troubleshooting, and verifying whether a candidate material family is chemically plausible.

Common mistakes

• Using one functional-group page as a complete material verdict without checking the rest of the spectrum.
• Assuming the strongest band is always the most diagnostic one.
• Forgetting that processing, additives, aging, and mixtures can shift or broaden expected peaks.

Verification advice

Use DSC, GC-MS, or TGA when several material families share similar bands or when mixture effects make the FTIR assignment uncertain.

Literature behind these assignments

• 2358 cm⁻¹ confidence 1.0

  “Broad [20, 35] vibration 2358 vibrational CO Carbon dioxide Sharp”

  Aziz 等 - 2023 - Water remediation capability of cubic-phase CdS na DOI: 10.15251/DJNB.2023.181.203
• 1000 cm⁻¹ confidence 1.0

  “The deformation band of C=O at around 1000 and cm-1 absorption peaks observed ordinary between 2300 and 2400 due to adsorbed CO 2”

  Structural and magnetic properties of Co-doped ZnO thin films grown by ultrasonic spray pyrolysis method DOI: 10.1016/j.spmi.2016.11.069
• 2363 cm⁻¹ confidence 1.0

  “The band at 2363 is due to cm-1 CO2, which is generally observed in IR spectra.”

  Choubey 等 - 2007 - Influence of doping on OH absorption in LiNbO3 cry DOI: 10.1002/crat.200610894
• 797 cm⁻¹ confidence 1.0

  “Inthespectralregion1250-400cm-1ofsoilsfromintermediateBh the spectra of horizon Bh and Bhs, with the exception of the peak at cm-1, 1160 andBhshorizons(Fig.1),wherethemineralphasesKOandTOappear, which disappears due to the very low content”

  Clabel 等 - 2020 - Organo-mineral associations in a Spodosol from nor DOI: 10.1016/j.geodrs.2020.e00303
• 1100 cm⁻¹ confidence 1.0

  “at the highest CO partial pressure, P(CO 2)=760Torr, on the four 2 investigatedsamples.Likewise,Fig.4Bsummarizestheadsorption isothermsbuiltupbyplottingthetotalintegratedabsorbance(normalized by weight and surface area) data for the spectra”

  Effect of gallia doping on the acid⠍base and redox properties of ceria DOI: 10.1016/j.apcata.2010.08.050
• 3708 cm⁻¹ confidence 1.0

  “cm-1 N3700 the absorption of which extends at frequency and thus overlapswiththe3708cm-1band.However,acloseinspectionofour spectra revealed that CO 2-rich minerals (for example haüyne and lazurite, Bellatreccia et al., 2009) systematically”

  FTIR microspectroscopy and SIMS study of water-poor cordierite from El Hoyazo, Spain: Application to mineral and melt devolatilization DOI: 10.1016/j.lithos.2009.05.031
• 2200 cm⁻¹ confidence 1.0

  “Normalized intensity is the integrated area of ing lost their labile compounds prior to sampling, as was 2200cm-1 the CO2 peak from 2400 to normalized to weight of the the case with the analysed POM having been sampled seven sample.”

  Demyan 等 - 2013 - Combining a coupled FTIR-EGA system and in situ DR DOI: 10.5194/bg-10-2897-2013
• 1387 cm⁻¹ confidence 1.0

  “Figure 5 depicts the temperature stability of the adsorbed species, cm-1 sample is heated above 500 K, the peaks at 1387 and 1362 desorption of carbon dioxide, and peak area of the adsorbed have disappeared and two new peaks appear at 1400”

  Durand 等 - 2010 - Reaction of Formic Acid over Amorphous Manganese O DOI: 10.1021/jp104629j